| http://www.w3.org/ns/prov#value | - re especially at risk; for them, ???chronic sleep loss has increasingly become the norm.???Studies have found that most U.S. students in middle school and high school don???t get the recommended amount of sleep ??? 81/2 to 91/2 hours on school nights; and that most high school seniors get an average of less than seven hours.More than 40 percent of the nation???s public high schools start classes b
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